Trouble calibrating the locking lever on Crank Machine

Discussion in 'Stringing Techniques / Stringing Machines' started by Sweet-Spot, Jun 8, 2013.

  1. Sweet-Spot

    Sweet-Spot Rookie

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    Need some help on a crank machine.


    its worked pretty flawlessly for over 30 rackets now but last night it started moving after the locking lever triggered.


    My problem is the readjustment of the locking lever as last night the tension head started slipping after the lever locked out.

    I followed the instructions in the manual to turn screws, but I am unable to get it just right so that it locks out without slipping when the string is pulled but moves freely when the lever is released and tucked under the tension head. It seems to have loosened up the whole head and the brake pads arent sitting well against the brake disc.

    Appreciate if you could shed any advice or if you've had this issue before. The screws in question were super tight initially but now they're easily moveable don't know if that is a good thing either.

    Below is the instructions in the manual. The machine at present cannot be used, and I've got a stack of rackets piling up!

    cheers

    [​IMG]
     
    #1
  2. Irvin

    Irvin G.O.A.T.

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    You should not be adjusting the lockout tensioner you should be adjusting the brake that is what keeps it from slipping after it locks out.
     
    #2
  3. Sweet-Spot

    Sweet-Spot Rookie

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    Thanks Irvin. The two adjustment points seemed to be interconnected ie when the lever moves now both the hexagonal nut head AND the hexagonal entry point (where I put in the allen key) near the crank handle move!

    Obviously not good....

    from the instructions above I dont really understand 'proper distance from the catch' Are they meaning horizontally left/right?
     
    #3
  4. Irvin

    Irvin G.O.A.T.

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    I am not sure how yours works but mine has to totally different adjustments for both.
     
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  5. Sweet-Spot

    Sweet-Spot Rookie

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    thanks Irvin. I'll try to ask the manufacturer, otherwise it might be time for either a new crank head, a WISE or a new machine, as I've already spent a few hours trying to get it right with no success!
     
    #5
  6. Sweet-Spot

    Sweet-Spot Rookie

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    I've received some good advice from Gamma Tech but thought I'd post the pics here in case anyone else can shed some light.

    [​IMG]

    [​IMG]

    [​IMG]

    [​IMG]
     
    #6
  7. Irvin

    Irvin G.O.A.T.

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    I am not real sure what type of light you're looking for but the pictures you're showing seem to be associated with the brake mechanism and not the tension. If you have a manual it should help.
     
    #7
  8. David 110

    David 110 New User

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    Your photos do show the tension head and not the brake assembly. What is the make an model of your machine?

    The adjustment is not complicated. Please refer to your photo taken from the owners manual. The operator is holding the hex head bolt using the wrench in his right hand and holding a hex key wrench in his left hand to make the adjustment. First slightly loosen (do not remove) the hex head bolt (right hand) which will then allow adjustment on the opposite side (left hand) using the hex key wrench. A very slight adjustment with the key wrench will make a difference and you may have to experiment a few times to get the best setting. When finished, re-tighten the hex nut (right hand) After completing the adjustment and tightening the hex head bolt, the large hex nut with attached locking arm will rotated slightly when released. Nothing else in the tension head should be rotating or moving.

    Hope this helps
     
    #8
  9. Sweet-Spot

    Sweet-Spot Rookie

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    Thanks David 110. I can follow your instructions, however after I get the settings just right tweaking the hex key...and I retighten the hex head with my right hand, it is affecting the brake pads by tightening it up and making the lockout lever unable to move.

    The machine is a very old epsilon machine. Its well made and sturdy and has served me well for quite a while now. I posted it here:

    http://tt.tennis-warehouse.com/showpost.php?p=7252724&postcount=603
     
    #9
  10. David 110

    David 110 New User

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    The adjustment is sensitive and can be frustrating when trying to get it set. Tightening the hex nut (right hand) will change the overall adjustment a little bit. Each time you make a hex key adjustment (left hand) the hex bolt must be tightened and then you check to see if it is working correctly. It usually takes few adjustments until you find the setting that works best.
     
    #10
  11. Sweet-Spot

    Sweet-Spot Rookie

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    These great instructions from GammaTech helped me recalibrate my machine. I am really grateful for the assist. Thank you! Posting here in the hope it might help someone else who has this issue in future

    and regarding my question about a tine, tiny amount of slip on the brake pads still

    GammaTech, I will send you a little thank you gift to your email. ENJOY!
     
    #11

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